http://rdf.ncbi.nlm.nih.gov/pubchem/patent/GB-773425-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1b525936794e2d1e2199ad39794d0760 |
| classificationCPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentcpc/C08F36-04 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C08F36-04 |
| filingDate | 1955-04-06-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationDate | 1957-04-24-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | GB-773425-A |
| titleOfInvention | Improvements in or relating to elastomers |
| abstract | Oil-resistant elastic films are formed from latices prepared by copolymerizing a conjugated diene hydrocarbon, an unsaturated nitrile and an a ,b -unsaturated monocarboxylic acid in aqueous emulsion in the presence of 0.01 to 0.05 oxidation equivalents of an inorganic peroxy salt or hydrogen peroxide and an amount of modifier equivalent to 0.01 to 1 mol. of primary dodecyl mercaptan, based on 100 mols. of monomers. Suitable dienes are those having 4 to 6 carbon atoms, e.g. butadiene. The nitrile may be acrylonitrile or methacrylonitrile. The acid may be acrylic, methacrylic or ethacrylic acid. Suitable peroxy salts are alkali metal persulphates, percarbonates and perborates. Suitable modifiers are primary, secondary and tertiary alkyl mercaptans having 10 to 16 carbon atoms, e.g. 4-n-butyl-1-octyl mercaptan, tert.-decyl mercaptan, tert.-hexadecyl mercaptan, n-cetyl mercaptan and di-n-butyl-n-propylcarbinthiol, xanthogens, e.g. bis-isopropyl xanthogen, and thiophenols, e.g. thiocresol, a -thionaphthol or b -thionaphthol. Emulsifiers, e.g. ethers and esters of polyglycols with aliphatic acids having 10 to 20 carbon atoms, alkyl sulphonates or sulphates, alkylaryl sulphonates and their amine salts, alkylaryl polyether sulphates or sulphated monoglycerides, and stabilizers, e.g. sodium lauryl and myristyl sulphates, may be added. Films may be prepared by dipping a former in the latex and curing the coating by heating in the presence of a compound of a polyvalent metal, e.g. tin, iron, lead, nickel, cobalt, or, preferably, calcium, strontium, barium, magnesium or zinc. The former or latex-coated former may be treated with a solution of a metal salt such as the chloride, nitrate, acetate or formate, e.g. an acetone solution of calcium nitrate tetrahydrate, which also serves as a coagulant. Alternatively a metal oxide, e.g. zinc oxide, may be incorporated in the latex made alkaline with a volatile or thermally unstable base, e.g. ammonia, methylamine, ethanolamine, morpholine or trimethyl benzyl ammonium hydroxide. Vulcanizing agents, e.g. sulphur, accelerators, e.g. zinc dimethyldithiocarbamate, and antioxidants, e.g. 2,21-methylene-bis-(4-methyl-6-tert.-butylphenol), may be added. The latices may be used to prepare baby pants, gloves, overshoes, girdles and brassieres. In Example (1) the polymerization is conducted in the presence of ethylenediaminetetra-acetic acid as chelating agent, stopped at 70 per cent conversion by adding 2,5 - di - tert. - butylhydroquinone and unreacted monomers and some water stripped by vacuum distillation. |
| priorityDate | 1954-04-16-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 84.